Well, Moon certainly hit the nail on the head. The Colander draft
of the Common LISP Manual mentions lexical function parameters as
examples of things that have indefinite extent, contrasting with
ALGOL, in which they also have lexical scope but instead have dynamic
extent. August issue 49 has confirmed that variables shall be
lexical and not local, but the question of extent was not addressed
or confirmed, and that is my fault.